ovp only controls the "E" in the cis-e system. It would cause rough idle, stalling, but would always restart.

Op, check fuel pressure when the car stalls, then check for spark.

The only things that can cause the stalling when warm with no restart until cold again are:

1. Fuel pump, or fuel pump relay
2. Crank position sensor. Should ohm ok at 1200ohms.
3. Ignition system failure including Distributer cap, rotor, and possibly wires.

Thats it.

__________________
Eugene

10 E63 AMG
93 300te 4matic
07 BMW X3
14 Ford F-150 Fx2

Coincidentally I am running into a similar problem on my 420SEL. Just happened all of a sudden. arg. I was on my way to work today. I pulled off the turnpike and noticed the engine rmps drop below 500. I pulled it down a gear, and kept them up for a bit. Then I hit the EZ pass line and had to stop. She stalled and didnt restart. I pulled all the relays, put them back. No difference. I tried to jumper the fuel pumps ON but it was hard to hear if they were on. I wasn't sure which 87 pin was the pumps. I tried all of them I think. One of them gave me a click somewhere in the engine. Maybe something to CIS. Anyway, towed it back home and sure enough it started up at the garage. Oy.

Best I can tell the pumps and accumulator are original at 225K.

__________________
Cruise Control not working? Send me PM or email (jamesdean59@gmail.com). I might be able to help out.
Check here for compatibility, diagnostics, and availability!

(4/11/2020: Hi Everyone! I am still taking orders and replying to emails/PMs/etc, I appreciate your patience in these crazy times. Stay safe and healthy!)


82 300SD 145k
89 420SEL 210k
89 560SEL 118k
90 300SE 262k RIP 5/25/2010
90 560SEL 154k
91 300D 2.5 Turbo. 241k
93 190E 3.0 235k
93 300E 195k

I received a new fuel pump relay for my 1992 190E 2.6 and go to install it. CAN'T LOCATE IT. It's not near the OVP and MAS. Did a search and read that it(FPR) is integrated into the MAS. Is this correct?. No FPR on the '92's

Correct. Fuel pump operations were integrated into the MAS unit..Around 1990 I believe.

__________________
Cruise Control not working? Send me PM or email (jamesdean59@gmail.com). I might be able to help out.
Check here for compatibility, diagnostics, and availability!

(4/11/2020: Hi Everyone! I am still taking orders and replying to emails/PMs/etc, I appreciate your patience in these crazy times. Stay safe and healthy!)


82 300SD 145k
89 420SEL 210k
89 560SEL 118k
90 300SE 262k RIP 5/25/2010
90 560SEL 154k
91 300D 2.5 Turbo. 241k
93 190E 3.0 235k
93 300E 195k

UPDATE: My problem was due to worn distributor cap and rotor. I bought a used MAS and tried that first but car didn't start. New cap and rotor and it started up. Problem solved.

dennish, glad to hear you resolved the problem.

__________________
Fred Hoelzle